Polan, E. U. (2007). Journey across the life span: Human development and health promotion (3rd ed.). F. A. Davis.
Lua i Stíl Chicago (17ú heag.)Polan, Elaine U. Journey Across the Life Span: Human Development and Health Promotion. 3rd ed. Philadelphia: F. A. Davis, 2007.
Lua MLA (9ú heag.)Polan, Elaine U. Journey Across the Life Span: Human Development and Health Promotion. 3rd ed. F. A. Davis, 2007.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.